Who is the best defensive sf in the nba?

Between the great sf defenders paul pierce,luol deng,caron butler,shawn marion,corey brewer,wilson chandler,gary forbes,tayshaun prince,courtney lee,chase budinger,danny granger,al-farou! aminu,ron artest,matt barnes,sam youn,shane battier,corey maggette,trevor ariza,shawne williams,andre iguodala,grant hill,michkael pietrus,gerald wallace,nicolas batum,richard jefferson,sonny weems,andrei kirilenko and josh howard? these are all the sf in the nba who are great at periamter defense and some post to i know some shouldnt be up there next to battier and artest or even wallace name but its your opinion who you think is between these people and give me a reason why you think your player is the best defending sf